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CWE-79 (在Web页面生成时对输入的转义处理不恰当(跨站脚本)) — Vulnerability Class 23663

23663 vulnerabilities classified as CWE-79 (在Web页面生成时对输入的转义处理不恰当(跨站脚本)). AI Chinese analysis included.

CWE-79 represents a critical input validation weakness where software fails to properly sanitize user-supplied data before rendering it in web pages. Attackers typically exploit this vulnerability by injecting malicious scripts, often JavaScript, into trusted websites. When other users view the compromised page, the embedded code executes in their browsers, allowing the attacker to steal session cookies, hijack accounts, or redirect victims to phishing sites. This breach of trust undermines user privacy and application integrity. To prevent such attacks, developers must implement robust input validation and output encoding strategies. By strictly filtering incoming data and ensuring that all dynamic content is properly escaped before being processed by the browser, developers can neutralize dangerous inputs and effectively mitigate the risk of cross-site scripting vulnerabilities.

MITRE CWE Description
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. There are many variants of cross-site scripting, characterized by a variety of terms or involving different attack topologies. However, they all indicate the same fundamental weakness: improper neutralization of dangerous input between the adversary and a victim.
Common Consequences (3)
Access Control, ConfidentialityBypass Protection Mechanism, Read Application Data
The most common attack performed with cross-site scripting involves the disclosure of private information stored in user cookies, such as session information. Typically, a malicious user will craft a client-side script, which -- when parsed by a web browser -- performs some activity on behalf of the…
Integrity, Confidentiality, AvailabilityExecute Unauthorized Code or Commands
In some circumstances it may be possible to run arbitrary code on a victim's computer when cross-site scripting is combined with other flaws, for example, "drive-by hacking."
Confidentiality, Integrity, Availability, Access ControlExecute Unauthorized Code or Commands, Bypass Protection Mechanism, Read Application Data
The consequence of an XSS attack is the same regardless of whether it is stored or reflected. The difference is in how the payload arrives at the server. XSS can cause a variety of problems for the end user that range in severity from an annoyance to complete account compromise. Some cross-site scri…
Mitigations (5)
Architecture and DesignUse a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid [REF-1482]. Examples of libraries and frameworks that make it easier to generate properly encoded output include Microsoft's Anti-XSS library, the OWASP ESAPI Encoding module, and Apache Wicket.
Implementation, Architecture and DesignUnderstand the context in which your data will be used and the encoding that will be expected. This is especially important when transmitting data between different components, or when generating outputs that can contain multiple encodings at the same time, such as web pages or multi-part mail messages. Study all expected communication protocols and data representations to determine the required e…
Architecture and Design, ImplementationUnderstand all the potential areas where untrusted inputs can enter your software: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide data to the application. Remember that such inputs may be obtained indirectly throug…
Effectiveness: Limited
Architecture and DesignFor any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
Architecture and DesignIf available, use structured mechanisms that automatically enforce the separation between data and code. These mechanisms may be able to provide the relevant quoting, encoding, and validation automatically, instead of relying on the developer to provide this capability at every point where output is generated.
Examples (2)
The following code displays a welcome message on a web page based on the HTTP GET username parameter (covers a Reflected XSS (Type 1) scenario).
$username = $_GET['username']; echo '<div class="header"> Welcome, ' . $username . '</div>';
Bad · PHP
http://trustedSite.example.com/welcome.php?username=<Script Language="Javascript">alert("You've been attacked!");</Script>
Attack
The following code displays a Reflected XSS (Type 1) scenario.
<% String eid = request.getParameter("eid"); %> ... Employee ID: <%= eid %>
Bad · JSP
<% protected System.Web.UI.WebControls.TextBox Login; protected System.Web.UI.WebControls.Label EmployeeID; ... EmployeeID.Text = Login.Text; %> <p><asp:label id="EmployeeID" runat="server" /></p>
Bad · ASP.NET
CVE IDTitleCVSSSeverityPublished
CVE-2021-24470 Yada Wiki < 3.4.1 - Contributor+ Stored XSS — Yada Wiki 5.4 -2021-08-02
CVE-2021-24468 Leaflet Map < 3.0.0 - Contributor+ Stored XSS — Leaflet Map 5.4 -2021-08-02
CVE-2021-24464 YouTube Embed, Playlist and Popup < 2.3.9 - Contributor+ Stored XSS — YouTube Embed, Playlist and Popup by WpDevArt 5.4 -2021-08-02
CVE-2021-24455 Tutor LMS < 1.9.2 - Authenticated Stored Cross-Site Scripting (XSS) — Tutor LMS – eLearning and online course solution 5.4 -2021-08-02
CVE-2021-24450 ProfilePress < 3.1.8 - Authenticated Stored XSS — User Registration, User Profiles, Login & Membership – ProfilePress (Formerly WP User Avatar) 4.8 -2021-08-02
CVE-2021-24448 Profile Builder < 3.4.8 - Authenticated Stored XSS — User Registration & User Profile – Profile Builder 4.8 -2021-08-02
CVE-2021-24443 Youzify < 1.0.7 - Stored Cross-Site Scripting via Biography — Youzify – BuddyPress Community, User Profile, Social Network & Membership Plugin for WordPress 5.4 -2021-08-02
CVE-2021-24428 RSS for Yandex Turbo <= 1.30 - Authenticated Stored XSS — RSS for Yandex Turbo 4.8 -2021-08-02
CVE-2021-24425 myStickymenu < 2.5.2 - Authenticated Stored XSS — Floating Notification Bar, Sticky Menu on Scroll, and Sticky Header for Any Theme – myStickymenu 4.8 -2021-08-02
CVE-2021-24444 TaxoPress < 3.0.7.2 - Authenticated Stored Cross-Site Scripting (XSS) — TaxoPress – Create and Manage Taxonomies, Tags, Categories 4.8 -2021-08-02
CVE-2021-35030 Zyxel GS1900-8 跨站脚本漏洞 — GS1900-8 Firmware 3.5 Low2021-07-26
CVE-2021-36092 XSS attack using special link in email — ((OTRS)) Community Edition 6.5 Medium2021-07-26
CVE-2021-21442 XSS vulnerability in Time Accounting — Time Accounting 4.5 Medium2021-07-26
CVE-2021-32792 XSS vulnerability when using OIDCPreservePost On in mod_auth_openidc — mod_auth_openidc 3.1 Low2021-07-26
CVE-2020-7390 Sage X3 Syracuse Persistent XSS in Edit User page — X3 4.6 Medium2021-07-22
CVE-2021-1599 Cisco Unified Customer Voice Portal Cross-Site Scripting Vulnerability — Cisco Unified Customer Voice Portal (CVP) 5.4 Medium2021-07-22
CVE-2021-32745 Reflected Cross-Site-Scripting vulnerability — online 7.3 High2021-07-21
CVE-2021-22723 EVlink City、EVlink Parking 跨站脚本漏洞 — EVlink City (EVC1S22P4 / EVC1S7P4 all versions prior to R8 V3.4.0.1), EVlink Parking (EVW2 / EVF2 / EV.2 all versions prior to R8 V3.4.0.1), and EVlink Smart Wallbox (EVB1A all versions prior to R8 V3.4.0.1 ) 5.4 -2021-07-21
CVE-2021-22722 多款Schneider Electric产品跨站脚本漏洞 — EVlink City (EVC1S22P4 / EVC1S7P4 all versions prior to R8 V3.4.0.1), EVlink Parking (EVW2 / EVF2 / EV.2 all versions prior to R8 V3.4.0.1), and EVlink Smart Wallbox (EVB1A all versions prior to R8 V3.4.0.1 ) 5.4 -2021-07-21
CVE-2021-22706 EVlink City、EVlink Parking 和 EVlink Smart Wallbox 跨站脚本漏洞 — EVlink City (EVC1S22P4 / EVC1S7P4 all versions prior to R8 V3.4.0.1), EVlink Parking (EVW2 / EVF2 / EV.2 all versions prior to R8 V3.4.0.1), and EVlink Smart Wallbox (EVB1A all versions prior to R8 V3.4.0.1 ) 5.4 -2021-07-21
CVE-2021-32669 Cross-Site Scripting in Backend Grid View — TYPO3.CMS 6.4 Medium2021-07-20
CVE-2021-32668 Cross-Site Scripting in Query Generator & Query View — TYPO3.CMS 6.4 Medium2021-07-20
CVE-2021-32667 Cross-Site Scripting in Page Preview — TYPO3.CMS 6.4 Medium2021-07-20
CVE-2021-24482 Related Posts for WordPress <= 2.0.4 - Authenticated Stored XSS & XFS — Related Posts for WordPress 4.8 -2021-07-19
CVE-2021-24452 W3 Total Cache < 2.1.5 - Reflected XSS in Extensions Page (JS Context) — W3 Total Cache 6.1 -2021-07-19
CVE-2021-24436 W3 Total Cache < 2.1.4 - Reflected XSS in Extensions Page (Attribute Context) — W3 Total Cache 6.1 -2021-07-19
CVE-2021-21803 Advantech R-SeeNet 跨站脚本漏洞 — Advantech 6.1 -2021-07-16
CVE-2021-21802 Advantech R-SeeNet 跨站脚本漏洞 — Advantech 6.1 -2021-07-16
CVE-2021-21801 Advantech R-SeeNet 跨站脚本漏洞 — Advantech 6.1 -2021-07-16
CVE-2021-21800 Advantech R-SeeNet 跨站脚本漏洞 — Advantech 6.1 -2021-07-16

Vulnerabilities classified as CWE-79 (在Web页面生成时对输入的转义处理不恰当(跨站脚本)) represent 23663 CVEs. The CWE taxonomy describes the weakness; review individual CVEs for product-specific impact.